US Bridges

Sully Road over Big Rocky Run

Fair

Fairfax County, Virginia · 00.30FR657/01.27TO662 · Structure no. 000000000006263

Built
1967
58 years old
Condition
Fair
inspected July 2023
Type
Culvert
Concrete
Length
43 ft
4 main spans
Daily traffic
99,760
2022 count
Owner
State
State Highway Agency

About this bridge

Sully Road over Big Rocky Run is a concrete culvert carrying Sully Road over Big Rocky Run in Fairfax County, Virginia. It was built in 1967, so it is 58 years old, older than the Virginia average of 50.7 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 99,760 vehicles a day, roughly 1% of them trucks, projected to reach 145,650 by 2045. The structure is 43 ft (13.1 m) long. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesSully Road
CrossesBig Rocky Run
Location00.30FR657/01.27TO662
RouteState Highway 28
CountyFairfax County
StateVirginia
Coordinates38.85226, -77.43277
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating99 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans4
Design loadHS 20
Structure length43 ft (13.1 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic99,760 (2022)
Projected traffic145,650 by 2045
Trucks1%
Lanes on structure8
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedRehabilitation because of general structure deterioration or inadequate strength
Estimated improvement cost$150 million
NavigationNo navigation control on waterway

Frequently asked questions

When was Sully Road over Big Rocky Run built?

It was built in 1967, making it 58 years old in 2025.

What condition is Sully Road over Big Rocky Run in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in July 2023.

How much traffic does Sully Road over Big Rocky Run carry?

About 99,760 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is Sully Road over Big Rocky Run?

The structure is 43 ft (13.1 m) long with a longest span of 10 ft (3 m).

Who owns Sully Road over Big Rocky Run?

It is owned by the State Highway Agency.